Whoops, meant to drop my feedback in a couple of days ago but this worked fine on both a single eVGA SC ACX 1.0 GTX 970 and works fine on my current SLI-enabled pair of MSI GTX 970 Gaming cards in the system (two of the same card). VGA driver safely disabled itself briefly even on my 4k MST monitor, low-res around 10 seconds, reverted back to 4K desktop, and showed the save box, spitting out a working BIOS file (tried flashing the same file onto the cards since nvflash does allow you to do so even though you can't flash modded ones yet , powered system off for 30 seconds, then turned back on... all remained as it was). This was under both 344.11 WHQL for the MSI card pair, and 344.16 Beta driver for the eVGA card.

EDIT:
Managed to overcome the issue. Here's the solution if anyone else become into this particular situation.
The card needs to installed as a secondary and then flashed. Because when trying to access the Eprom the screen becomes coloured, seen some of them and nothing happens.

All this with 5.196 NVflash
The most strange to me was when flashed the EVGA SC BIOS this issue wan't present, but backward from it to any other BIOS it appears. May some restriction from them or some kind of incomparability with the flash tool itself.

Hope helped you guys.

EDIT2:
On another note, W1zz
The BIOS saved with this version of GPU-z cannot be flashed with 5.196 NVflash
Saved with Palit tundermaster 2.6 works like a charm - the tool can be found here - http://www.palit.biz/palit/vgapro.php?id=2405 under download section and works with all cards. So if anyone wants to backup the existing rom of his card, that's the proper way

If you need to observe them deeply here are both BIOS saved with GPU-z and Tundermaster and named so respectively inside the archive.
Even though comparing them says they're identical, the NVtflash refuses to flash the one for some reason...at least on my system.

New Member

//edit: btw can confirm too nvflash 5.196 doesn't fix the issue at all, I have to disable the nvidia drivers in the device manager prior to use nvflash 5.196 for it to work without error spammings and screen lag until reboot

New Member

I also get a black screen when i try to save my vbios on my lenovo y50 with a gtx860m 4gb. I would really appreciate any help I can get because I'm tired of being stuck at a low overclock.
I tried your version but it doesn't work

New Member

Using the test version from this thread or the latest 0.8.1 release, I also get the error that reading the BIOS is unsupported on my device. Win7 x64, ForceWare 347.52, and an EVGA GTX970 SSC ACX 2.0+ 04G-P4-3975-KR. Using JoeDirt's NVFlash v5.206.0.1, I am able to manually save the BIOS after disabling the device.

New Member

Using the test version from this thread or the latest 0.8.1 release, I also get the error that reading the BIOS is unsupported on my device. Win7 x64, ForceWare 347.52, and an EVGA GTX970 SSC ACX 2.0+ 04G-P4-3975-KR. Using JoeDirt's NVFlash v5.206.0.1, I am able to manually save the BIOS after disabling the device.